20425145 has 8 divisors (see below), whose sum is σ = 26395656. Its totient is φ = 15083136.

The previous prime is 20425121. The next prime is 20425159. The reversal of 20425145 is 54152402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 139129 + 20286016 = 373^2 + 4504^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20425145 - 2¹⁶ = 20359609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20425145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157052 + ... + 157181.

It is an arithmetic number, because the mean of its divisors is an integer number (3299457).

Almost surely, 2^20425145 is an apocalyptic number.

It is an amenable number.

20425145 is a deficient number, since it is larger than the sum of its proper divisors (5970511).

20425145 is a wasteful number, since it uses less digits than its factorization.

20425145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314251.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20425145 is about 4519.4186573054. The cubic root of 20425145 is about 273.3516603152.

Adding to 20425145 its reverse (54152402), we get a palindrome (74577547).

The spelling of 20425145 in words is "twenty million, four hundred twenty-five thousand, one hundred forty-five".